Fix pitch persistence to prevent view drift on reload

Problem: Map pitch was always forced to 45° instead of being restored,
causing the view to appear shifted higher after each reload

- Save current pitch value to localStorage on moveend
- Restore pitch from localStorage on map initialization
- Remove forced pitch=45 on map load event
- Default to 45° only if no saved pitch exists

This prevents the map from drifting north/higher with each page reload
while maintaining the 3D tilt effect.

Auth: Session persistence already implemented via localStorage tokens
- Tokens are saved in localStorage and restored on mount
- Auto-refresh runs every 30s to keep session alive
- If session issues persist, check browser console for specific errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/Map/useMapCore.js

@@ -82,7 +82,8 @@ export function useMapCore(theme) {
         if (typeof v.lat === "number" && typeof v.lon === "number" && typeof v.zoom === "number") {
           map.setCenter([v.lon, v.lat]);
           map.setZoom(v.zoom);
-          map.setPitch(45); // tilt 3D forcé
+          // Restore pitch from storage, default to 45 if not saved
+          map.setPitch(typeof v.pitch === "number" ? v.pitch : 45);
           hadLastView = true;
         }
       }
@@ -106,7 +107,7 @@ export function useMapCore(theme) {
 
     map.on("load", () => {
       setViewParams(getViewFromMap(map));
-      map.setPitch(45); // tilt 3D forcé au load
+      // Don't force pitch on load - let it stay as configured
     });
 
     map.on("moveend", () => {
@@ -116,7 +117,12 @@ export function useMapCore(theme) {
         const center = vp.center;
         localStorage.setItem(
           LAST_VIEW_KEY,
-          JSON.stringify({ lat: center[1], lon: center[0], zoom: map.getZoom() })
+          JSON.stringify({
+            lat: center[1],
+            lon: center[0],
+            zoom: map.getZoom(),
+            pitch: map.getPitch()
+          })
         );
       } catch {}
     });